Electrical signaling and alarm apparatus.



c. H. POOL. v 7 ELECTRICAL SIGNALINGAND ALARM APPARATUS.

nrmuumu 211.111: HOV. 0,1910.

Patented Feb. 14', 1911.

UNITED STATES PATENT OFFICE.

CLARK H. IOOL, OF NEW YORK, N-. Y.,' ASSIGNOR TO INTERNATIONAL ELECTRIC PROTECTION COMPANY, A CORPORATION OF NEW YORK.

ELECTRICAL SIGNALING AND ALARM APPARATUS.

Specification of Letters Patent.

Application fiIed November 8, 1910. Serial No. 591,321.

To all whom it may concern:

Be it'kIlOWIl that I, CLARK H. PooL, a

' citizen of the United States, residing at New York, inthe county of-New York and State of New York, have invented a certain new and useful Improvement in Electrical Signaling and Alarm Apparatus, of which the following is a specification.

The invention relates to an apparatus for sending signals to a distant station, from a place to be protected, and also giving an The principle alarm. v

of the invention is as follows: An electrically controlled signaling device is normally in automatic test-circuit, upon and the alarm are set'in operation; the one to g i send signals,'the other (if, as here shown, of

the sound producing type) to produce a loud noise.

The accompanying drawing exhibits my invention in electrical d1agra1n.- r

A' and B are thermostatic circuit controllers,

, stats, The thermostat Acomprises a case with diaphragm 7v 1, preferably of insulating material, between the flange clamped a metallic diaphragm 4. In' the bottom of the case is an adjustable contactscrew, 5 which passes through the air charm the]: formed between the diaphragm and bottom, and is normally in contact with .said diaphragm, The thermostat B s similarly constructed except that the adjustable contact-screw 6 is disposed on the outerside of the diaphragm l and is carried by a spring 8, secured to the clamping ring The screw 6 is adjusted normally out of cont-act The air chambers formed between case and diaphragm in'both thfei'n ostats are connected by an air. pipe C,

which may be of small diameter and indefii nite length, and led around the place to be protected, so as to be exposed to rise of atbut .which last-named circuit,

in the additional called hereafter for brevity thermo- 2 of which and a ring 3, is'

magnet F, wire 7 of hermostat B, contact-screw (ilnormaily mospheric temperature. In the bottoms of the cases are provided the usual air vents 10.

D is analarm device and comprises a cupshaped case 11, which may be of magnetic material, having its open end closed by a metal diaphragm 12 secured in place by the frusto-conical ring 13, in which is mounted a sound magnifying cone or trumpet 14. Withincase 11 is secured an electro-magnet 15, to the armature 16 of which is attached a diaphragm 12. Said diaphragm carries a brass rod 17 which moves freely in an opening in the'case'bottom. A lug on said rod enters'anotch'in a. contactspring 18, seoured to the case, but insulated therefrom. The end of spring 18 comes opposite to an ad justable contact-screw' 19 which passes through an insulating bushing in the case bottom. Magnet 15. is normally deenergized, and the contacts 18 and 19 are sep arated. 2

E is a code wheel controlling the spring contacts 20, 21 to transmit make and break signals to any suitable indicating device not'shownlocated at a dista'nt station. On

the shaft of'said wheel are two disks 22-, 23.

disk 22 has a' pin 245w its -face,.which pm at each rotation ofthe disltoperates the pivoted circuit breaking switch 25. The

disk 23 has a notch in its rim to receive the bent over end of the pivoted detent 26'which is operated by'electromagnet E.

At Gris a splitbattery, one sectionv g of. which is preferably weaker than the remain-- mg section '9 An automatic test -andhence normally closed -circuit proceeds from one pole of the section g of split battery to switch 25, 'magnet F; ire 27, to diaphragm lot thermostat A, to contact-screw 5, wire-28, wire ,29, to the other pole Patented Feb. 14,1911,

of battery sectionflrj.) The strength of the .current from section g is to be su'flicient to keep this eircuit,'asj stated, undereutoinatic test, but not sufficient toenergize magnet F to cause said magnet-to raise the detent" 26,.hnd so free thesignaling' device. An additional source of current is provided,

namely, section '9 of'batt'ery B. In order to cut in this additional source, which is preferably stronger than the source supplying the automatic test circuit, and also the audible alarm device D, a lead proceeds from one pole of section 9, to switch 25,- 27, wire 30, diaphragm 7 out of contact with said diaphragm) spring 8, wire 13, magnet 15 in alarm device D, and by wire 32 to opposite pole of section" 5/; or, in other words, the entire battery G is connected. A lead is also established by way of wire 33, to spring 18, contact 19 and wire 29, to a point between the two connected battery sections 9, 9.

The operation is as follows: When the atmospheric temperature in the neighborhood of thermostats A, 13 increases at a predetermined fixed rate, the .air in the chambcrs closed by the diaphragms of said thermostats, moves diaphragm 4 of thermostat A out of contact with screw and dia-- phragm i of thermostat B into contact with screw 6. id agnet F now receives the full battery current and moves the detent 260111; of the notch. in disk 23. The code wheel E is now free to belrotated by the usual clock work mechanism to make and break circuit at ontacts 20, 21, and so transmit a signal. hpin 24 on disk 22 meets switch 25 and holr it open. Hence when the notch in; disk 23 comes'nnder the bent over end of dctent 26, said end engages again-in the notch in disk 2 3, and the rotation of the signal apparatus is stopped. By reason of the passage of the whole battery current through magnet 15, said magnet attracts its armature l6 against'the resiliency of diaphragm 12, and, at the same time, moves the lug at the end ofrodlr' away from the notch in spring 18. Vhen the switch 25 is opened by the pin 24 to interrupt the circuit, as above described, the diaphragm 12 is released and swings back beyond its neutral position, thus carrying spring 18 into contact with screw 1: thus again completing circuit through magnet 15, by way of battery section g, wire 29, contact-screw 19,

spring 18, wire 33, diaphragm T, screw 6, spring 8, wire 31, magnet 15', wire 32, to other side of battery section g. The diaphragm is thus set into rapid vibration, and produces a. loud sound wh1ch= is amplified by the trumpet 14: until conditions are restored, which permit the diaphragm 7 once more to break circuit at screw 6.

I- claim:

1. In combination with an electrically con trolled. signaling device disposed in an automatic. test circuit whereon the current strength is not sufficient to operate said device, of an additional source of current and an alarm, and thermostatic means operated by a rise in surrounding temperature, for

cutting said additional source and said alarm into said circuit and thereby actuatingfboth. said signaling device and said alarm.

2. The combination of a signaling mcchanism, an electroanagnet controlling said mechanism, two sources of current of different strengths, an electrically operated alarm, and a thermostat normally closing circuit from said weaker source only to said eleotro-magnet, and a second thermostat normally opening circuit from said stronger source to' thesame and to said alarm:; the said thermostats operating under a. rise in atmospheric temperatureto connect both of said currentsources with said magnet and the stronger source to said alarm.

.In testimony-whereof I have afiixed my signature in "presence of two witnesses.

CLARK H. POOL-I it-messes GERTRUDE T. Ponrnn', MAY T. MoGARnY. 

